Intel® Architecture Instruction Set Extensions Programming Reference

INSTRUCTION SET REFERENCE
PSUBUSB/PSUBUSW — Subtract Packed Unsigned Integers with Unsigned Saturation
Opcode/
Instruction
Description
Op/
En
64/3
2-bit
Mode
CPUID
Feature
Flag
Description
66 0F D8 /r A V/V SSE2 Subtract packed unsigned byte integers in xmm2/m128 from packed
unsigned byte integers in xmm1 and saturate result.
PSUBUSB xmm1, xmm2/m128
66 0F D9 /r A V/V SSE2 Subtract packed unsigned word integers in xmm2/m128 from packed
unsigned word integers in xmm1 and saturate result.
PSUBUSW xmm1, xmm2/m128
VEX.NDS.128.66.0F.WIG D8 /r B V/V AVX Subtract packed unsigned byte integers in xmm3/m128 from packed
unsigned byte integers in xmm2 and saturate result.
VPSUBUSB xmm1, xmm2,
xmm3/m128
VEX.NDS.128.66.0F.WIG D9 /r B V/V AVX Subtract packed unsigned word integers in xmm3/m128 from packed
unsigned word integers in xmm2 and saturate result.
VPSUBUSW xmm1, xmm2,
xmm3/m128
VEX.NDS.256.66.0F.WIG D8 /r B V/V AVX2 Subtract packed unsigned byte integers in ymm3/m256 from packed
unsigned byte integers in ymm2 and saturate result.
VPSUBUSB ymm1, ymm2,
ymm3/m256
VEX.NDS.256.66.0F.WIG D9 /r B V/V AVX2 Subtract packed unsigned word integers in ymm3/m256 from packed
unsigned word integers in ymm2 and saturate result.
VPSUBUSW ymm1, ymm2,
ymm3/m256
Instruction Operand Encoding
Op/En Operand 1 Operand 2 Operand 3 Operand 4
A ModRM:reg (r, w) ModRM:r/m (r) NA NA
B ModRM:reg (w) VEX.vvvv ModRM:r/m (r) NA
Performs a SIMD subtract of the packed unsigned integers of the second source operand from the packed unsigned
integers of the first source operand and stores the packed unsigned integer results in the destination operand. See
Figure 9-4 in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 1, for an illustration of a
SIMD operation. Overflow is handled with unsigned saturation, as described in the following paragraphs.
The first source and destination operands are XMM registers. The second source operand can be either an XMM
register or a 128-bit memory location.
The PSUBUSB instruction subtracts packed unsigned byte integers. When an individual byte result is less than zero,
the saturated value of 00H is written to the destination operand.
The PSUBUSW instruction subtracts packed unsigned word integers. When an individual word result is less than
zero, the saturated value of 0000H is written to the destination operand.
128-bit Legacy SSE version: The second source operand is an XMM register or a 128-bit memory location. The first
source operand and destination operands are XMM registers. Bits (255:128) of the corresponding YMM destination
register remain unchanged.
VEX.128 encoded version: The second source operand is an XMM register or a 128-bit memory location. The first
source operand and destination operands are XMM registers. Bits (127:128) of the corresponding YMM register are
zeroed.
VEX.256 encoded version: The second source operand is an YMM register or a 256-bit memory location. The first
source operand and destination operands are YMM registers.
5-158 Ref. # 319433-014